Problem-Solving and Data Analysis - Probability and Conditional Probability — Quiz 2

Questions in this quiz (10)

1. A study of $$820$$ students recorded whether they use social media daily and their study habits. The data are summarized below. If one student is selected at random, what is the probability that the student uses social media daily?

   • $$\frac{1}{820}$$
   • $$\frac{430}{820}$$
   • $$\frac{390}{820}$$
   • $$\frac{430}{390}$$

2. A box contains $$80$$ marbles. The probability of selecting a green marble is $$0.25$$. How many marbles in the box are green?

   • $$10$$
   • $$20$$
   • $$25$$
   • $$40$$

3. Customer purchases at a grocery store are shown below.If one customer is selected at random, what is the probability that the customer did not purchase a drink?

   • $$\frac{40}{100}$$
   • $$\frac{25}{100}$$
   • $$\frac{15}{100}$$
   • $$\frac{30}{100}$$

4. A music class has $$30$$ students. The table shows their instrument types. If one student is selected at random, what is the probability that the student plays drums?

   • $$0.20$$
   • $$0.25$$
   • $$0.27$$
   • $$0.30$$

5. A collection of $$90$$ shells is classified as shown. If one shell is selected at random, what is the probability that it is spiral?

   • $$\frac{18}{42}$$
   • $$\frac{18}{30}$$
   • $$\frac{18}{90}$$
   • $$\frac{42}{90}$$

6. Each of $$200$$ beads is classified by color as shown. If one bead is selected at random, what is the probability that it is blue?

   • $$\frac{50}{200}$$
   • $$\frac{120}{200}$$
   • $$\frac{30}{200}$$
   • $$\frac{170}{200}$$

7. A table summarizes members of a club by age and membership type.If one member is selected at random, what is the probability that the member is at least $$25$$ years old?

   • $$\frac{35}{140}$$
   • $$\frac{60}{140}$$
   • $$\frac{105}{140}$$
   • $$\frac{80}{140}$$

8. The table shows votes for a class president by grade level. If one student is selected at random, what is the probability that the student voted for Alex?

   • $$\frac{10}{80}$$
   • $$\frac{30}{80}$$
   • $$\frac{12}{80}$$
   • $$\frac{20}{80}$$

9. A fair $$20$$-sided die is labeled from $$1$$ to $$20$$. If the die is rolled once, what is the probability of rolling a multiple of $$5$$?

   • $$\frac{1}{20}$$
   • $$\frac{2}{20}$$
   • $$\frac{4}{20}$$
   • $$\frac{5}{20}$$

10. There are $$k$$ science books and $$8$$ history books on a shelf. If one book is selected at random, what is the probability of selecting a science book, in terms of $$k$$?

    • $$\frac{k}{8}$$
    • $$\frac{k}{k+8}$$
    • $$\frac{8}{k}$$
    • $$\frac{8}{k+8}$$